An interferometric form of Fermat's principle is presented for redatuming PS transmission traveltimes to be those for sources lowered to the target body. The velocity model does not need to be known for redatuming, so the distorting effects of uninteresting parts of the velocity model and statics are eliminated by this target-oriented approach. Thus, traveltime tomography applied to the redatumed PS traveltimes has the potential for higher resolution of that target body's velocity distribution from earthquake and VSP data.
ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology